Merge branch 'ps/setup-reinit-fixes'

"git init" to reinitialize a repository that already exists cannot change the hash function and ref backends; such a request is silently ignored now. * ps/setup-reinit-fixes: setup: fix reinit of repos with incompatible GIT_DEFAULT_HASH setup: fix reinit of repos with incompatible GIT_DEFAULT_REF_FORMAT t0001: remove duplicate test